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- 저자 : Eskandarian, Azim (검색결과 16 건)
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Mohammadreza Eskandarian,Mohammadreza Eskandarian,Javad Zabarjadi,Ali Ehsani,Amirhossein Afshar 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.1
The recovery of silver from X-ray film processing effluents by precipitation using hydrogen peroxide as the precipitating agent was studied. Response surface methodology (RSM) and central composite design (CCD) were applied to achieve optimum conditions. Linear, square and interactions effects between parameters to study of a second order polynomial equation were obtained. Optimum condition included the volume of H2O2 0.8 ml/min, pH=5.5, ethylene glycol 9 ml in the experimental condition. In these conditions silver recovery percentage was predicted as 92.8%. The experiment was conducted in triplicate under optimized conditions. Silver recovery percentage and average of precipitate were obtained as 91.5% and 423.19mg, respectively, which were close to the predicted amount achieved by the model.
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Improvement of Dynamic Behavior of Shunt Active Power Filter Using Fuzzy Instantaneous Power Theory
Eskandarian, Nasser,Beromi, Yousef Alinejad,Farhangi, Shahrokh The Korean Institute of Power Electronics 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.6
Dynamic behavior of the harmonic detection part of an active power filter (APF) has an essential role in filter compensation performances during transient conditions. Instantaneous power (p-q) theory is extensively used to design harmonic detectors for active filters. Large overshoot of p-q theory method deteriorates filter response at a large and rapid load change. In this study the harmonic estimation of an APF during transient conditions for balanced three-phase nonlinear loads is conducted. A novel fuzzy instantaneous power (FIP) theory is proposed to improve conventional p-q theory dynamic performances during transient conditions to adapt automatically to any random and rapid nonlinear load change. Adding fuzzy rules in p-q theory improves the decomposition of the alternating current components of active and reactive power signals and develops correct reference during rapid and random current variation. Modifying p-q theory internal high-pass filter performance using fuzzy rules without any drawback is a prospect. In the simulated system using MATLAB/SIMULINK, the shunt active filter is connected to a rapidly time-varying nonlinear load. The harmonic detection parts of the shunt active filter are developed for FIP theory-based and p-q theory-based algorithms. The harmonic detector hardware is also developed using the TMS320F28335 digital signal processor and connected to a laboratory nonlinear load. The software is developed for FIP theory-based and p-q theory-based algorithms. The simulation and experimental tests results verify the ability of the new technique in harmonic detection of rapid changing nonlinear loads.
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Polarized Discourse in Reporting the US Sanctions against Iran on CNN and Press TV News Websites
Farzaneh Eskandarian 고려대학교 응용문화연구소 2020 에피스테메 Vol.0 No.23
The purpose of this research is to study the polarized discourse as encoded in the ideological structures of reports by the two Iranian and American news websites: CNN and Press TV. The researcher analyzes online news texts on the US sanctions against Iran from the randomly selected news during a specific period of time. The study of these news reports is implemented in the framework of Critical Discourse Analysis. The ideological characteristics of the polarization are found in the quotation patterns and labeling. Therefore, this research draws an inference at how the two news websites represent a distinction between ‘us’ versus ‘them’ by emphasizing the in-groups and de-emphasizing the out-groups. Moreover, it is proved that the news texts of each website devalue statements by the ‘other’ who is not present and, in this regard, direct quotations are avoided.
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Improvement of Dynamic Behavior of Shunt Active Power Filter Using Fuzzy Instantaneous Power Theory
Nasser Eskandarian,Yousef Alinejad Beromi,Shahrokh Farhangi 전력전자학회 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.6
Dynamic behavior of the harmonic detection part of an active power filter (APF) has an essential role in filter compensation performances during transient conditions. Instantaneous power (p?q) theory is extensively used to design harmonic detectors for active filters. Large overshoot of p?q theory method deteriorates filter response at a large and rapid load change. In this study the harmonic estimation of an APF during transient conditions for balanced three-phase nonlinear loads is conducted. A novel fuzzy instantaneous power (FIP) theory is proposed to improve conventional p?q theory dynamic performances during transient conditions to adapt automatically to any random and rapid nonlinear load change. Adding fuzzy rules in p?q theory improves the decomposition of the alternating current components of active and reactive power signals and develops correct reference during rapid and random current variation. Modifying p?q theory internal high-pass filter performance using fuzzy rules without any drawback is a prospect. In the simulated system using MATLAB/SIMULINK, the shunt active filter is connected to a rapidly time-varying nonlinear load. The harmonic detection parts of the shunt active filter are developed for FIP theory-based and p?q theory-based algorithms. The harmonic detector hardware is also developed using the TMS320F28335 digital signal processor and connected to a laboratory nonlinear load. The software is developed for FIP theory-based and p?q theory-based algorithms. The simulation and experimental tests results verify the ability of the new technique in harmonic detection of rapid changing nonlinear loads.
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Mohammad Reza Eskandarian,Mohammadhossein Rasoulifard,Mostafa Fazli,Leila Ghalamchi,최혁 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.6
To facilitate decomposition of imidacloprid (IMD), as a persistent probe insecticide, TiO2-Fe3O4 (TF) nanocomposite was synthesized and characterized. TF particles in size of 50-60 nm with band-gap of 2.8 eV were immobilized onto glass tubes and utilized as a photocatalyst irradiated with ultraviolet-light emitting diode (UV-LED) powered by photovoltaics. Synergistic decomposition of IMD in the photocatalytic reactor injected with persulfate (PS) was investigated. Along with various control and reference tests, parametric studies to evaluate the effects of PS concentration, IMD concentration, and circulation rate on IMD decomposition kinetics and electrical energy consumption were performed. The contribution of various physical and chemical mechanisms to IMD removal was discussed, including self-decomposition, direct photolytic decomposition, chemical oxidation by PS, photolysis of PS to produce sulfate radicals, Fenton-like reaction to produce sulfate radicals, photocatalysis to generate hydroxyl radicals, and adsorption onto catalysts. TF conjugated with PS under UV-LED synergistically decomposed IMD. Additionally, results demonstrated the synergy index factor of 75%, 65%, and 60% for IMD degradation by UV-LED/TF/PS, UV-LED/Fe3O4/PS, and UVLED/ TiO2/PS routes, respectively. Outcomes also showed that utilizing TF can greatly reduce electrical energy consumption. Since all devices used in this study, including UV-LED, were powered solely by a photovoltaic module, the immobilized TF photoreactor was proposed as a sustainable, self-powered, energy-saving, and practical point-of-use decontamination system to remove organic contaminants in water under solar radiation.
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SOFTWARE ARCHITECTURE FOR ADAPTIVE COLLISION AVOIDANCE SYSTEMS
Blum, Jeremy,Eskandarian, Azim The Korean Society of Automotive Engineers 2002 International journal of automotive technology Vol.3 No.2
Emergent Collision Avoidance Systems (CAS's) are beginning to assist drivers by performing specific tasks and extending the limits of driver's perception. As CAS's evolve from simple systems handling discrete tasks to complex systems managing interrelated driving tasks, the risk of failure from hidden causes greatly increases. The successful implementation of such a complex system depends upon a robust software architecture. Host of the difficulty in implementing system arises from interconnections between the components. The CAS architecture presented in this paper focuses on these interconnections to mitigate this problem. Moreover, by constructing the GAS architecture through the composition of existing architectural styles, the resulting system will exhibit predictable qualities. Some of the qualities represent limitations that translate into constraints on the system. Others are beneficial aspects that satisfy stakeholder requirements .
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SOFTWARE ARCHITECTURE FOR ADAPTIVE COLLISION AVOIDANCE SYSTEMS
Jeremy Blum,Azim Eskandarian 한국자동차공학회 2002 International journal of automotive technology Vol.3 No.2
Emergent Collision Avoidance Systems (CAS's) are beginning to assist drivers by performing specific tasks and extending the limits of driver's perception. As CAS's evolve from simple systems handling discrete tasks to complex systems managing interrelated driving tasks, the risk of failure from hidden causes greatly increases. The successful implementation of such a complex system depends upon a robust software architecture. Most of the difficulty in implementing system arises from interconnections between the components. The CAS architecture presented in this paper focuses on these interconnections to mitigate this problem. Moreover, by constructing the CAS architecture through the composition of existing architectural styles. the resulting system will exhibit predictable qualities. Some of the qualities represent limitations that translate into constraints on the system. Others are beneficial aspects that satisfy stakeholder requirements.
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Fatemeh Mahdizadeh,Mohammadreza Eskandarian 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Nanoporous SiO2 was synthesized by sol–gel method using dry yeast cells as a template. Additionally, characterization of the biosynthesized nanoporous SiO2 was investigated. Bio-synthesized nanoporous SiO2 has the specific surface area of 460 m2/g and total pore volume of 0.36 cm3/g. Co-immobilization of glucose oxidase and catalase by adsorption method was done on biosynthesized nanoporous SiO2 and immobilized enzymes were used for removal of water dissolved oxygen. Additionally, modeling and optimization for removal of water dissolved oxygen was performed using rotatable response surface methodology (RSM). Experimental values were in good agreement with the predicated ones and the model was highly significant.
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EFFECT OF DROWSINESS ON DRIVING PERFORMANCE VARIABLES OF COMMERCIAL VEHICLE DRIVERS
A. MORTAZAVI,A. ESKANDARIAN,R. A. SAYED 한국자동차공학회 2009 International journal of automotive technology Vol.10 No.3
Driver drowsiness is a major safety concern, especially among commercial vehicle drivers, and is responsible for thousands of accidents and numerous fatalities every year. The design of a drowsiness detection system is based on identifying suitable driver-related and/or vehicle-related variables that are correlated to the driver’s level of drowsiness. Among different candidates, vehicle control variables seem to be more promising since they are unobtrusive, easy to implement, and cost effective. This paper focuses on in-depth analysis of different driver-vehicle control variables, e.g., steering angle, lane keeping, etc. that are correlated with the level of drowsiness. The goal is to find relationships and to characterize the effect of a driver’s drowsiness on measurable vehicle or driving variables and set up a framework for developing a drowsiness detection system. Several commercial drivers were tested in a simulated environment and different variables were recorded. This study shows that drowsiness has a major impact on lane keeping and steering control behavior. The correlation of the number and type of accidents with the level of drowsiness was also examined. Significant patterns in lateral position variations and steering corrections were observed, and two phases of drowsiness-related degradation in steering control were identified. The two steering degradation phases examined are suitable features for use in drowsiness detection systems. Driver drowsiness is a major safety concern, especially among commercial vehicle drivers, and is responsible for thousands of accidents and numerous fatalities every year. The design of a drowsiness detection system is based on identifying suitable driver-related and/or vehicle-related variables that are correlated to the driver’s level of drowsiness. Among different candidates, vehicle control variables seem to be more promising since they are unobtrusive, easy to implement, and cost effective. This paper focuses on in-depth analysis of different driver-vehicle control variables, e.g., steering angle, lane keeping, etc. that are correlated with the level of drowsiness. The goal is to find relationships and to characterize the effect of a driver’s drowsiness on measurable vehicle or driving variables and set up a framework for developing a drowsiness detection system. Several commercial drivers were tested in a simulated environment and different variables were recorded. This study shows that drowsiness has a major impact on lane keeping and steering control behavior. The correlation of the number and type of accidents with the level of drowsiness was also examined. Significant patterns in lateral position variations and steering corrections were observed, and two phases of drowsiness-related degradation in steering control were identified. The two steering degradation phases examined are suitable features for use in drowsiness detection systems.
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